Valve for gas-engines.



G. H. JOHNSTON.

' VALVE FOR GAS ENGINES.

APPLICATION FILED MAY 29, 1913. v 1 1 24,9 1 1 ammoz (fol/3v slow.

Patented Jan. 12, 1915.

UNITED STATES PATENT OFFICE.

GEORGE H. JOHNSTON, 0F APOLLO, PENNSYLVANIA.

VALVE FOR GAS-ENGINES.

To all whom it may concern Be it known that I, GEORGE H. JOHNSTON,

reters for internal combustion engines and.

the object of my invention is to provide a carbureter which may be employed with either gaseous or liquid fuel.

A further object of my invention is to provide a carbureter in which the various air and fuel adjustments are simple and in which the admission of air and fuel does not in any way depend upon the action of springs which readily get out of adjustment.

lViththese and other objects in View, my invention will be more fully described, illustrated in the accompanying drawing, and then specifically. pointed out in the claim which is attached to and forms a part of this application.

In the drawing: Figure. 1 is a perspective viewof my improved carbureter; Fig. 2 is a top plan view; Fig. 3 is a central vertical sectional view; Fig. 1 is an inverted perspective view of the puppet valve employed tocontrol the supply of fuel to the carbureter.

Corresponding and like parts are referred to in the following description and indicatedin all the views of the drawing by the same reference characters.

The preferred embodiment of my invention, as illustrated in the drawing, consists primarily of a hollow cylindrical body portion 10 provided adjacent its upper end with a laterally directed, internally threaded branch or nipple 11 adapted to receive one end of the manifold leading from the carbureter to the engine cylinder or cylinders. A spider 12 is formed integrally with the lower end of this casing and afuel supply tube 13 extends upwardly centrally through the spider, its lower end extending a slight distance below the lower end of the body.10 to form a bearing for a disk valve 14 for which the spider 12 forms a seat, the radial arms of the spider and of the disk valve being so proportioned as to permit Specification, of Letters Patent.

the screw and the ear 15.

considerably raise or lower the same,

Patented Jan. 12, 1915.

Application filed May 29, 1913. Serial No. 770,703.

substantially a half opening of the lower end of the carbureter body. The disk valve is fitted about the lower end of the tube 13 and is provided at one side with a radially extended, circumferentially slotted ear 15 through which is passed a screw 16, the upper end of which is threaded into a lug 17 cast integrally with the body 10. This screw serves to hold the valve in engagement against its valve seat and also to limit the turning movement thereof and in order to prevent loosening of the valve through repeated adjustment of the same, a spring washer 18 is inserted between the head of The disk valve is further provided with a radially extending arm 19 by means of which the valve may bev rotated and this arm is provided with an upwardly directed pin 20 arranged to move over a scale -21 inscribed upon the body 10 and from which the extent to which the valve is opened may be readily determined.

The upper end of the body 10 is closed by a cap 22 having a centrally formed boss 23 which seats closely in the upper end of the body, the cap being secured in place by one or more set screws 21 passed through the body 10 and engaging the peripheral face of the boss portion of the cap, as clearly shown in Fig. 3. The cap is provided centrally with a threaded bore, the threads 25 of which are of relatively great pitch and the upper portion of an adjustable stop 26 is threaded for engagement with the threads of this bore. It will therefore be apparent that even'a partial rotation of the stop gill lower end of the stop terminates in a head v or valve stop proper 27, the lower face of which is checkered asat 28 and said valve stop limits the upward, movement of a puppet valve 29 which is seated over the upper end of the tube 13 and held against displacement therefrom by a plurality of spaced legs 80 extending into the upper end of the tube. The valve engaging face of the valve stop is checkered to prevent sticking of the valve to the stop and consequent long continued opening of .the valve.

The outer or free end of the adjustable stop 26 is reduced to form a stud 31 adapt ed to receive a collar 32 which in turn, carries a radially directed arm 33 provided at its outer end with a bearing 34: for a spring bureter- The peripheral faces of the upper portion of the body of the carbureter and of the adjacent portion of the cap 22 are provided with a plurality of alined 1 notches or teeth 36 for engagement by the pawl 35 to adjustably secure the throttle and its operation will valve in position. The upper face of the cap 22 is provided with a scale 37 by which the amount of openingof the throttle valve may be readily determined.

The above described carbureter may be employed with either liquid or gaseous fuel be readily understood from an inspection of the drawing, it being apparent that the fuel will be drawn through .the tube 13 by the suction of air through the body of the carbureter to raise the valve 29 as far as permitted by the throttle lever adjustment. The fuel and air so admitted will be mixed in the upper part of the carbureter body or mixing chamber and passed from there through the branch 11 and intake manifold to the cylinder.

Having thus described the invention, what is claimed as new is:

In a carbureter, a body open at its lower end and providing a mixing and carbureting chamber, end of the body member and provided with a central opening, a fuel supply pipe extending, through the spider, a lug formed exteriorly of the body member at its open end, a disk valve mounted for turning movement about the supply pipe andaseating against the lower face of the spider, said valve being free of connection to the supply pipe, a slotted extension formed on the disk valve, and a screw passed through the slot of the extension and into the lug to secure the disk valve against disengagement and permit it to have a limited turning movement. 7

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE H. JOHNSTON. [L. s.]

Witnesses:

HARRY L. HELMAN, S. M. JAMISON.

a spider partially closing the open 

